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                <h1 class="post-title" itemprop="name headline"> PHP高级特性三之文件上传和下载 </h1>
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                    <time title="创建时间：2015-03-09 14:12:47" itemprop="dateCreated datePublished" datetime="2015-03-09T14:12:47+08:00">2015-03-09</time>
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                <h2 id="综述"><a href="#综述" class="headerlink" title="综述"></a>综述</h2>
                <p>上一节我们学习了文件的读写操作，这一节我们来看一下文件上传和下载的相关内容。</p>
                <h2 id="文件上传"><a href="#文件上传" class="headerlink" title="文件上传"></a>文件上传</h2>
                <h3 id="1-PHP配置文件"><a href="#1-PHP配置文件" class="headerlink" title="1.PHP配置文件"></a>1.PHP配置文件</h3>
                <p>首先，我们文件上传需要设定一下 php.ini 的配置文件。这是最基本的设置，如果这里设置不成功，那么代码写得再正确也没有用。基本的配置项目如下</p>
                <blockquote>
                  <p>file_uploads = on #文件上传开启 upload_max_filesize= 200M #文件上传的最大尺寸 upload_tmp_dir = c:/uploads/ #临时文件目录 post_max_size = 250M #POST时最大尺寸，必须要大于 upload_max_filesize</p>
                </blockquote>
                <h3 id="2-上传时注意事项"><a href="#2-上传时注意事项" class="headerlink" title="2.上传时注意事项"></a>2.上传时注意事项</h3>
                <p>1） 文件上传操作表单提交方法必须为 post 2）文件上传时，input type 必须为 file 类型 3）文件上传的表单中，需要增加一个隐含内容，代码如下，value 的单位是 B</p>
                <figure class="highlight pgsql">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">&lt;<span class="keyword">input</span> <span class="keyword">type</span>="hidden" <span class="type">name</span>="MAX_FILE_SIZE" <span class="keyword">value</span>="100000000"&gt;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>4）enctype=”multipart/form-data” 只有文件上传时才使用这个值，用来指定表单编码的数据方式，让服务器知道我们要传递一个文件并带有一些常规的表单信息。如下</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">"upload.php"</span> <span class="attr">method</span>=<span class="string">"post"</span> <span class="attr">enctype</span>=<span class="string">"multipart/form-data"</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>例如</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line"> <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line"> <span class="tag">&lt;<span class="name">title</span>&gt;</span> File Uploads <span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"> <span class="tag">&lt;/<span class="name">head</span>&gt;</span> </span><br><span class="line"> <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"> <span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">"b.php"</span> <span class="attr">method</span>=<span class="string">"post"</span> <span class="attr">enctype</span>=<span class="string">"multipart/form-data"</span>&gt;</span></span><br><span class="line"> shopname: <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"shopname"</span> &gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line"> shopprice: <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"price"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line"> shopnum : <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"num"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line"> shoppic: <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"file"</span> <span class="attr">name</span>=<span class="string">"pic"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line"> <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">name</span>=<span class="string">"sub"</span> <span class="attr">value</span>=<span class="string">"添加商品"</span>&gt;</span></span><br><span class="line"> <span class="tag">&lt;/<span class="name">form</span>&gt;</span> </span><br><span class="line"> <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>文件 a.php 表单提交到了 b.php 文件，在文件 b.php 中如下</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span> </span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> <span class="string">"&lt;pre&gt;"</span>;</span></span><br><span class="line"><span class="php"> print_r($_POST);</span></span><br><span class="line"><span class="php"> print_r($_FILES);</span></span><br><span class="line"><span class="php"> <span class="keyword">echo</span> <span class="string">"&lt;/pre&gt;"</span>;</span></span><br><span class="line"><span class="php"><span class="meta">?&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>一个是输出 POST得到的数据内容，另一个是输出获取到的文件信息。 运行结果如下</p>
                <figure class="highlight php">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">Array</span></span><br><span class="line">(</span><br><span class="line">    [shopname] =&gt; abc</span><br><span class="line">    [price] =&gt; abc</span><br><span class="line">    [num] =&gt; add</span><br><span class="line">    [sub] =&gt; 添加商品</span><br><span class="line">)</span><br><span class="line"><span class="keyword">Array</span></span><br><span class="line">(</span><br><span class="line">    [pic] =&gt; <span class="keyword">Array</span></span><br><span class="line">        (</span><br><span class="line">            [name] =&gt; QPGF.dll</span><br><span class="line">            [type] =&gt; application/qscall-plugin</span><br><span class="line">            [tmp_name] =&gt; D:\wamp\tmp\phpC2C7.tmp</span><br><span class="line">            [error] =&gt; <span class="number">0</span></span><br><span class="line">            [size] =&gt; <span class="number">199224</span></span><br><span class="line">        )</span><br><span class="line"></span><br><span class="line">)</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>如果不加 enctype=”multipart/form-data” 那么 print_r($_FILES) 不会有任何输出 又比如<strong>多文件上传</strong></p>
                <figure class="highlight vim">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="symbol">&lt;html&gt;</span></span><br><span class="line"> <span class="symbol">&lt;head&gt;</span></span><br><span class="line"> <span class="symbol">&lt;title&gt;</span> File Uploads &lt;/title&gt;</span><br><span class="line"> &lt;/head&gt; </span><br><span class="line"> <span class="symbol">&lt;body&gt;</span></span><br><span class="line"> &lt;form action=<span class="string">"b.php"</span> method=<span class="string">"post"</span> enctype=<span class="string">"multipart/form-data"</span>&gt;</span><br><span class="line"> shopname: &lt;<span class="built_in">input</span> <span class="built_in">type</span>=<span class="string">"text"</span> name=<span class="string">"shopname"</span> &gt; <span class="symbol">&lt;br&gt;</span></span><br><span class="line"> shopprice: &lt;<span class="built_in">input</span> <span class="built_in">type</span>=<span class="string">"text"</span> name=<span class="string">"price"</span>&gt; <span class="symbol">&lt;br&gt;</span></span><br><span class="line"> shopnum : &lt;<span class="built_in">input</span> <span class="built_in">type</span>=<span class="string">"text"</span> name=<span class="string">"num"</span>&gt; <span class="symbol">&lt;br&gt;</span></span><br><span class="line"> shoppic: &lt;<span class="built_in">input</span> <span class="built_in">type</span>=<span class="string">"file"</span> name=<span class="string">"pic1"</span>&gt; <span class="symbol">&lt;br&gt;</span></span><br><span class="line"> shoppic: &lt;<span class="built_in">input</span> <span class="built_in">type</span>=<span class="string">"file"</span> name=<span class="string">"pic2"</span>&gt; <span class="symbol">&lt;br&gt;</span></span><br><span class="line"> shoppic: &lt;<span class="built_in">input</span> <span class="built_in">type</span>=<span class="string">"file"</span> name=<span class="string">"pic3"</span>&gt; <span class="symbol">&lt;br&gt;</span></span><br><span class="line"> &lt;<span class="built_in">input</span> <span class="built_in">type</span>=<span class="string">"submit"</span> name=<span class="string">"sub"</span> value=<span class="string">"添加商品"</span>&gt;</span><br><span class="line"> &lt;/form&gt; </span><br><span class="line"> &lt;/body&gt;</span><br><span class="line">&lt;/html&gt;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>file的name需要不同的名字，那么上面的代码输出结果为</p>
                <figure class="highlight php">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">Array</span></span><br><span class="line">(</span><br><span class="line">    [pic1] =&gt; <span class="keyword">Array</span></span><br><span class="line">        (</span><br><span class="line">            [name] =&gt; libtcmalloc.dll</span><br><span class="line">            [type] =&gt; application/qscall-plugin</span><br><span class="line">            [tmp_name] =&gt; D:\wamp\tmp\phpE51E.tmp</span><br><span class="line">            [error] =&gt; <span class="number">0</span></span><br><span class="line">            [size] =&gt; <span class="number">178232</span></span><br><span class="line">        )</span><br><span class="line"></span><br><span class="line">    [pic2] =&gt; <span class="keyword">Array</span></span><br><span class="line">        (</span><br><span class="line">            [name] =&gt; libexpatw.dll</span><br><span class="line">            [type] =&gt; application/qscall-plugin</span><br><span class="line">            [tmp_name] =&gt; D:\wamp\tmp\phpE52E.tmp</span><br><span class="line">            [error] =&gt; <span class="number">0</span></span><br><span class="line">            [size] =&gt; <span class="number">130104</span></span><br><span class="line">        )</span><br><span class="line"></span><br><span class="line">    [pic3] =&gt; <span class="keyword">Array</span></span><br><span class="line">        (</span><br><span class="line">            [name] =&gt; AsyncTask.dll</span><br><span class="line">            [type] =&gt; application/qscall-plugin</span><br><span class="line">            [tmp_name] =&gt; D:\wamp\tmp\phpE52F.tmp</span><br><span class="line">            [error] =&gt; <span class="number">0</span></span><br><span class="line">            [size] =&gt; <span class="number">84536</span></span><br><span class="line">        )</span><br><span class="line"></span><br><span class="line">)</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>还可以将name设定为一个数组，如</p>
                <figure class="highlight pgsql">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">shoppic: &lt;<span class="keyword">input</span> <span class="keyword">type</span>="file" <span class="type">name</span>="pic[]"&gt; &lt;br&gt;</span><br><span class="line">shoppic: &lt;<span class="keyword">input</span> <span class="keyword">type</span>="file" <span class="type">name</span>="pic[]"&gt; &lt;br&gt;</span><br><span class="line">shoppic: &lt;<span class="keyword">input</span> <span class="keyword">type</span>="file" <span class="type">name</span>="pic[]"&gt; &lt;br&gt;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>则输出会是一个三维数组</p>
                <figure class="highlight php">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">Array</span></span><br><span class="line">(</span><br><span class="line">    [pic] =&gt; <span class="keyword">Array</span></span><br><span class="line">        (</span><br><span class="line">            [name] =&gt; <span class="keyword">Array</span></span><br><span class="line">                (</span><br><span class="line">                    [<span class="number">0</span>] =&gt; libtcmalloc.dll</span><br><span class="line">                    [<span class="number">1</span>] =&gt; libexpatw.dll</span><br><span class="line">                    [<span class="number">2</span>] =&gt; QQProtect.dll</span><br><span class="line">                )</span><br><span class="line"></span><br><span class="line">            [type] =&gt; <span class="keyword">Array</span></span><br><span class="line">                (</span><br><span class="line">                    [<span class="number">0</span>] =&gt; application/qscall-plugin</span><br><span class="line">                    [<span class="number">1</span>] =&gt; application/qscall-plugin</span><br><span class="line">                    [<span class="number">2</span>] =&gt; application/qscall-plugin</span><br><span class="line">                )</span><br><span class="line"></span><br><span class="line">            [tmp_name] =&gt; <span class="keyword">Array</span></span><br><span class="line">                (</span><br><span class="line">                    [<span class="number">0</span>] =&gt; D:\wamp\tmp\phpA17D.tmp</span><br><span class="line">                    [<span class="number">1</span>] =&gt; D:\wamp\tmp\phpA17E.tmp</span><br><span class="line">                    [<span class="number">2</span>] =&gt; D:\wamp\tmp\phpA17F.tmp</span><br><span class="line">                )</span><br><span class="line"></span><br><span class="line">            [error] =&gt; <span class="keyword">Array</span></span><br><span class="line">                (</span><br><span class="line">                    [<span class="number">0</span>] =&gt; <span class="number">0</span></span><br><span class="line">                    [<span class="number">1</span>] =&gt; <span class="number">0</span></span><br><span class="line">                    [<span class="number">2</span>] =&gt; <span class="number">0</span></span><br><span class="line">                )</span><br><span class="line"></span><br><span class="line">            [size] =&gt; <span class="keyword">Array</span></span><br><span class="line">                (</span><br><span class="line">                    [<span class="number">0</span>] =&gt; <span class="number">178232</span></span><br><span class="line">                    [<span class="number">1</span>] =&gt; <span class="number">130104</span></span><br><span class="line">                    [<span class="number">2</span>] =&gt; <span class="number">387128</span></span><br><span class="line">                )</span><br><span class="line"></span><br><span class="line">        )</span><br><span class="line"></span><br><span class="line">)</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <h3 id="3-文件上传后的检查"><a href="#3-文件上传后的检查" class="headerlink" title="3. 文件上传后的检查"></a>3. 文件上传后的检查</h3>
                <p>加入上传的表单中文件的name是pic，那么检查的四个方法如下： 1）使用 $_FILES[‘file’][‘error’] 检查错误 2）使用 $_FILES[‘file’][‘size’] 限制大小，单位是字节 3）使用 $_FILES[‘pic’][‘type’] 获取文件或站名，限制文件的类型 4）将上传后的文件名改名</p>
                <figure class="highlight bash">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">&lt;?php</span><br><span class="line">	//step 1 使用<span class="variable">$_FILES</span>[<span class="string">'pic'</span>][<span class="string">"error"</span>] 检查错误</span><br><span class="line"></span><br><span class="line">	<span class="keyword">if</span>(<span class="variable">$_FILES</span>[<span class="string">"pic"</span>][<span class="string">"error"</span>] &gt; 0)&#123;</span><br><span class="line">		switch(<span class="variable">$_FILES</span>[<span class="string">"pic"</span>][<span class="string">"error"</span>]) &#123;</span><br><span class="line">			<span class="keyword">case</span> 1:</span><br><span class="line">				<span class="built_in">echo</span> <span class="string">"上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值&lt;br&gt;"</span>;</span><br><span class="line">                  <span class="built_in">break</span>;</span><br><span class="line">			<span class="keyword">case</span> 2:</span><br><span class="line">				<span class="built_in">echo</span> <span class="string">"上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值"</span>;</span><br><span class="line">				<span class="built_in">break</span>;</span><br><span class="line"></span><br><span class="line">			<span class="keyword">case</span> 3: </span><br><span class="line">				<span class="built_in">echo</span> <span class="string">"文件只有部分被上传"</span>;</span><br><span class="line">				<span class="built_in">break</span>;</span><br><span class="line"></span><br><span class="line">			<span class="keyword">case</span> 4:</span><br><span class="line">				<span class="built_in">echo</span> <span class="string">"没有文件被上传"</span>;</span><br><span class="line">				<span class="built_in">break</span>;</span><br><span class="line"></span><br><span class="line">			default:</span><br><span class="line"></span><br><span class="line">				<span class="built_in">echo</span> <span class="string">"末知错误"</span>;</span><br><span class="line">		</span><br><span class="line">	&#125;</span><br><span class="line">		<span class="built_in">exit</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	<span class="variable">$maxsize</span>=5000000;  //50k</span><br><span class="line"></span><br><span class="line">	//step 2 使用<span class="variable">$_FILES</span>[<span class="string">"pic"</span>][<span class="string">"size"</span>] 限制大小 单位字节 2M=2000000</span><br><span class="line">	<span class="keyword">if</span>(<span class="variable">$_FILES</span>[<span class="string">"pic"</span>][<span class="string">"size"</span>] &gt; <span class="variable">$maxsize</span> ) &#123;</span><br><span class="line">		<span class="built_in">echo</span> <span class="string">"上传的文件太大，不能超过&#123;<span class="variable">$maxsize</span>&#125;字节"</span>;</span><br><span class="line">		<span class="built_in">exit</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	//step 3 使用<span class="variable">$_FILES</span>[<span class="string">"pic"</span>][<span class="string">"type"</span>]或是文件的扩展名 限制类型 MIME  image/gif  image/png    gif png jpg</span><br><span class="line"></span><br><span class="line">	/*   list(<span class="variable">$dl</span>, <span class="variable">$xl</span>) = explode(<span class="string">"/"</span>, <span class="variable">$_FILES</span>[<span class="string">"pic"</span>][<span class="string">"type"</span>]);</span><br><span class="line"></span><br><span class="line">		<span class="keyword">if</span>(<span class="variable">$dl</span>!=<span class="string">"image"</span>)&#123;</span><br><span class="line">			<span class="built_in">echo</span> <span class="string">"请上传一个图片，不充许其它类型文件"</span>;</span><br><span class="line">			<span class="built_in">exit</span>;</span><br><span class="line">		&#125;</span><br><span class="line">	 */</span><br><span class="line">	</span><br><span class="line">	<span class="variable">$allowtype</span>=array(<span class="string">"png"</span>, <span class="string">"gif"</span>, <span class="string">"jpg"</span>, <span class="string">"jpeg"</span>);</span><br><span class="line">	<span class="variable">$arr</span>=explode(<span class="string">"."</span>, <span class="variable">$_FILES</span>[<span class="string">"pic"</span>][<span class="string">"name"</span>]);</span><br><span class="line">	<span class="variable">$hz</span>=<span class="variable">$arr</span>[count(<span class="variable">$arr</span>)-1];</span><br><span class="line">	<span class="keyword">if</span>(!in_array(<span class="variable">$hz</span>, <span class="variable">$allowtype</span>))&#123;</span><br><span class="line">		<span class="built_in">echo</span> <span class="string">"这是不充许的类型"</span>;</span><br><span class="line">		<span class="built_in">exit</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	//step 4 将让传后的文件名改名</span><br><span class="line"></span><br><span class="line">	</span><br><span class="line">	<span class="variable">$filepath</span>=<span class="string">"./uploads/"</span>;</span><br><span class="line">	<span class="variable">$randname</span>=date(<span class="string">"Y"</span>).date(<span class="string">"m"</span>).date(<span class="string">"d"</span>).date(<span class="string">"H"</span>).date(<span class="string">"i"</span>).date(<span class="string">"s"</span>).rand(100, 999).<span class="string">"."</span>.<span class="variable">$hz</span>;</span><br><span class="line">	//将临时位置的文件移动到指定的目录上即可</span><br><span class="line">	<span class="keyword">if</span>(is_uploaded_file(<span class="variable">$_FILES</span>[<span class="string">"pic"</span>][<span class="string">"tmp_name"</span>]))&#123;</span><br><span class="line">		<span class="keyword">if</span>(move_uploaded_file(<span class="variable">$_FILES</span>[<span class="string">"pic"</span>][<span class="string">"tmp_name"</span>], <span class="variable">$filepath</span>.<span class="variable">$randname</span>))&#123;</span><br><span class="line">			<span class="built_in">echo</span> <span class="string">"上传成功"</span>;</span><br><span class="line">		&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">			<span class="built_in">echo</span> <span class="string">"上传失败"</span>;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">		<span class="built_in">echo</span> <span class="string">"不是一个上传文件"</span>;</span><br><span class="line">	&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>以上便实现了文件上传的检测，包括错误检测，文件大小检测，文件类型检测以及文件更名等等。</p>
                <h2 id="文件上传类"><a href="#文件上传类" class="headerlink" title="文件上传类"></a>文件上传类</h2>
                <p>在上面的介绍中，我们没有将文件的上传做一个封装，不过，将文件上传个功能封装成一个类的确是一个不错的选择。下面便是一个实例DEMO，让我们来感受一下吧！</p>
                <figure class="highlight reasonml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="module-access"><span class="module"><span class="identifier">FileUpload</span>.</span></span><span class="keyword">class</span>.php</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight xml">
                  <table>
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                      <td class="gutter">
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                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span></span></span><br><span class="line"><span class="php">	<span class="class"><span class="keyword">class</span> <span class="title">FileUpload</span> </span>&#123;</span></span><br><span class="line"><span class="php">	</span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $filePath;     <span class="comment">//指定上传文件保存的路径</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $allowType=<span class="keyword">array</span>(<span class="string">'gif'</span>, <span class="string">'jpg'</span>, <span class="string">'png'</span>, <span class="string">'jpeg'</span>);  <span class="comment">//充许上传文件的类型</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $maxSize=<span class="number">1000000</span>;  <span class="comment">//允上传文件的最大长度 1M</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $isRandName=<span class="keyword">true</span>;  <span class="comment">//是否随机重命名， true false不随机，使用原文件名</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $originName;   <span class="comment">//源文件名称</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $tmpFileName;   <span class="comment">//临时文件名</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $fileType;  <span class="comment">//文件类型</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $fileSize;  <span class="comment">//文件大小</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $newFileName; <span class="comment">//新文件名</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $errorNum=<span class="number">0</span>;  <span class="comment">//错误号</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> $errorMess=<span class="string">""</span>; <span class="comment">//用来提供错误报告</span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="php">		<span class="comment">//用于对上传文件初使化</span></span></span><br><span class="line"><span class="php">		<span class="comment">//1. 指定上传路径， 2，充许的类型， 3，限制大小， 4，是否使用随机文件名称</span></span></span><br><span class="line"><span class="php">		<span class="comment">//让用户可以不用按位置传参数，后面参数给值不用将前几个参数也提供值</span></span></span><br><span class="line"><span class="php">		<span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">($options=array<span class="params">()</span>)</span></span>&#123;</span></span><br><span class="line"><span class="php">			<span class="keyword">foreach</span>($options <span class="keyword">as</span> $key=&gt;$val)&#123;</span></span><br><span class="line"><span class="php">				<span class="comment">//查看用户参数中数组的下标是否和成员属性名相同</span></span></span><br><span class="line"><span class="php">				<span class="keyword">if</span>(!in_array($key,get_class_vars(get_class(<span class="keyword">$this</span>))))&#123;</span></span><br><span class="line"><span class="php">					<span class="keyword">continue</span>;</span></span><br><span class="line"><span class="php">				&#125;</span></span><br><span class="line"><span class="php">				<span class="comment">//设置成员变量</span></span></span><br><span class="line"><span class="php">				<span class="keyword">$this</span>-&gt;setOption($key, $val);</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"><span class="php">	</span></span><br><span class="line"></span><br><span class="line"><span class="php">		<span class="comment">//获得错误原因</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">getError</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="php">			<span class="comment">//获得错误原因</span></span></span><br><span class="line"><span class="php">			$str=<span class="string">"上传文件&lt;font color='red'&gt;&#123;$this-&gt;originName&#125;&lt;/font&gt;时出错："</span>;</span></span><br><span class="line"><span class="php">			<span class="keyword">switch</span>(<span class="keyword">$this</span>-&gt;errorNum)&#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">case</span> <span class="number">4</span>: $str .= <span class="string">"没有文件被上传"</span>; <span class="keyword">break</span>;</span></span><br><span class="line"><span class="php">				<span class="keyword">case</span> <span class="number">3</span>: $str .= <span class="string">"文件只被部分上传"</span>; <span class="keyword">break</span>;</span></span><br><span class="line"><span class="php">				<span class="keyword">case</span> <span class="number">2</span>: $str .= <span class="string">"上传文件超过了HTML表单中MAX_FILE_SIZE选项指定的值"</span>; <span class="keyword">break</span>;</span></span><br><span class="line"><span class="php">				<span class="keyword">case</span> <span class="number">1</span>: $str .= <span class="string">"上传文件超过了php.ini 中upload_max_filesize选项的值"</span>; <span class="keyword">break</span>;</span></span><br><span class="line"><span class="php">				<span class="keyword">case</span> <span class="number">-1</span>: $str .= <span class="string">"不被充许的类型"</span>; <span class="keyword">break</span>;</span></span><br><span class="line"><span class="php">				<span class="keyword">case</span> <span class="number">-2</span>: $str .= <span class="string">"文件过大，上传文件不能超过&#123;$this-&gt;maxSize&#125;个字节"</span>; <span class="keyword">break</span>;</span></span><br><span class="line"><span class="php">				<span class="keyword">case</span> <span class="number">-3</span>: $str .= <span class="string">"上传失败"</span>; <span class="keyword">break</span>;</span></span><br><span class="line"><span class="php">				<span class="keyword">case</span> <span class="number">-4</span>: $str .= <span class="string">"建立存放上传文件目录失败，请重新指定上传目录"</span>; <span class="keyword">break</span>;</span></span><br><span class="line"><span class="php">				<span class="keyword">case</span> <span class="number">-5</span>: $str .= <span class="string">"必须指定上传文件的路径"</span>; <span class="keyword">break</span>;</span></span><br><span class="line"><span class="php">				<span class="keyword">default</span>: $str .=  <span class="string">"末知错误"</span>;</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"><span class="php">			<span class="keyword">return</span> $str.<span class="string">'&lt;br&gt;'</span>;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"><span class="php">	</span></span><br><span class="line"><span class="php">		</span></span><br><span class="line"><span class="php">		<span class="comment">//用来检查文件上传路径</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">checkFilePath</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="php">			<span class="keyword">if</span>(<span class="keyword">empty</span>(<span class="keyword">$this</span>-&gt;filePath)) &#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">$this</span>-&gt;setOption(<span class="string">'errorNum'</span>, <span class="number">-5</span>);</span></span><br><span class="line"><span class="php">				<span class="keyword">return</span> <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"><span class="php">			<span class="keyword">if</span>(!file_exists(<span class="keyword">$this</span>-&gt;filePath) || !is_writable(<span class="keyword">$this</span>-&gt;filePath))&#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">if</span>(!@mkdir(<span class="keyword">$this</span>-&gt;filePath, <span class="number">0755</span>))&#123;</span></span><br><span class="line"><span class="php">					<span class="keyword">$this</span>-&gt;setOption(<span class="string">'errorNum'</span>, <span class="number">-4</span>);</span></span><br><span class="line"><span class="php">					<span class="keyword">return</span> <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">				&#125;</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"><span class="php">			<span class="keyword">return</span> <span class="keyword">true</span>;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"><span class="php">		</span></span><br><span class="line"><span class="php">		<span class="comment">//用来检查文件上传的大小</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">checkFileSize</span><span class="params">()</span> </span>&#123;</span></span><br><span class="line"><span class="php">			<span class="keyword">if</span>(<span class="keyword">$this</span>-&gt;fileSize &gt; <span class="keyword">$this</span>-&gt;maxSize)&#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">$this</span>-&gt;setOPtion(<span class="string">'errorNum'</span>, <span class="string">'-2'</span>);</span></span><br><span class="line"><span class="php">				<span class="keyword">return</span> <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">			&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">return</span> <span class="keyword">true</span>;</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"></span><br><span class="line"><span class="php">		<span class="comment">//用于检查文件上传类型</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">checkFileType</span><span class="params">()</span> </span>&#123;</span></span><br><span class="line"><span class="php">			<span class="keyword">if</span>(in_array(strtolower(<span class="keyword">$this</span>-&gt;fileType), <span class="keyword">$this</span>-&gt;allowType)) &#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">return</span> <span class="keyword">true</span>;</span></span><br><span class="line"><span class="php">			&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">$this</span>-&gt;setOption(<span class="string">'errorNum'</span>, <span class="number">-1</span>);</span></span><br><span class="line"><span class="php">				<span class="keyword">return</span> <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"><span class="php">		</span></span><br><span class="line"><span class="php">		<span class="comment">//设置上传后的文件名称</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">setNewFileName</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="php">			<span class="keyword">if</span>(<span class="keyword">$this</span>-&gt;isRandName)&#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">$this</span>-&gt;setOption(<span class="string">'newFileName'</span>, <span class="keyword">$this</span>-&gt;proRandName());</span></span><br><span class="line"><span class="php">			&#125; <span class="keyword">else</span> &#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">$this</span>-&gt;setOption(<span class="string">'newFileName'</span>, <span class="keyword">$this</span>-&gt;originName);</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="php">		<span class="comment">//设置随机文件名称</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">proRandName</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="php">			$fileName=date(<span class="string">"YmdHis"</span>).rand(<span class="number">100</span>,<span class="number">999</span>);</span></span><br><span class="line"><span class="php">			<span class="keyword">return</span> $fileName.<span class="string">'.'</span>.<span class="keyword">$this</span>-&gt;fileType;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"><span class="php">		</span></span><br><span class="line"><span class="php">		<span class="comment">//设置成员变量</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">setOption</span><span class="params">($key, $val)</span></span>&#123;</span></span><br><span class="line"><span class="php">			<span class="keyword">$this</span>-&gt;$key=$val;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"><span class="php">		</span></span><br><span class="line"><span class="php">		<span class="comment">//用来上传一个文件</span></span></span><br><span class="line"><span class="php">		<span class="function"><span class="keyword">function</span> <span class="title">uploadFile</span><span class="params">($fileField)</span></span>&#123;</span></span><br><span class="line"><span class="php">			</span></span><br><span class="line"><span class="php">			<span class="keyword">echo</span> $fileField;</span></span><br><span class="line"><span class="php">			<span class="comment">//默认返回值为True</span></span></span><br><span class="line"><span class="php">			$return=<span class="keyword">true</span>;</span></span><br><span class="line"><span class="php">			<span class="comment">//首先检查文件上传路径</span></span></span><br><span class="line"><span class="php">			<span class="keyword">if</span>(!<span class="keyword">$this</span>-&gt;checkFilePath())&#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">$this</span>-&gt;errorMess=<span class="keyword">$this</span>-&gt;getError();</span></span><br><span class="line"><span class="php">				<span class="keyword">return</span> <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"></span><br><span class="line"><span class="php">			<span class="comment">//获得上传文件的名字</span></span></span><br><span class="line"><span class="php">			$name=$_FILES[$fileField][<span class="string">'name'</span>];</span></span><br><span class="line"><span class="php">			<span class="comment">//获得临时文件名</span></span></span><br><span class="line"><span class="php">			$tmp_name=$_FILES[$fileField][<span class="string">'tmp_name'</span>];</span></span><br><span class="line"><span class="php">			<span class="comment">//获得上传文件的大小</span></span></span><br><span class="line"><span class="php">			$size=$_FILES[$fileField][<span class="string">'size'</span>];</span></span><br><span class="line"><span class="php">			<span class="comment">//获得上传错误代号</span></span></span><br><span class="line"><span class="php">			$error=$_FILES[$fileField][<span class="string">'error'</span>];</span></span><br><span class="line"><span class="php">			</span></span><br><span class="line"><span class="php">			<span class="comment">//如果上传的是多个文件</span></span></span><br><span class="line"><span class="php">			<span class="keyword">if</span>(is_Array($name))&#123;</span></span><br><span class="line"><span class="php">				<span class="comment">//错误代号必须也是Array，因为一个文件对应一个错误代号</span></span></span><br><span class="line"><span class="php">				$errors=<span class="keyword">array</span>();</span></span><br><span class="line"><span class="php">				<span class="comment">//遍历检查文件</span></span></span><br><span class="line"><span class="php">				<span class="keyword">for</span>($i=<span class="number">0</span>; $i&lt;count($name); $i++)&#123;</span></span><br><span class="line"><span class="php">					<span class="keyword">if</span>(<span class="keyword">$this</span>-&gt;setFiles($name[$i], $tmp_name[$i], $size[$i], $error[$i]))&#123;</span></span><br><span class="line"><span class="php">						<span class="keyword">if</span>(!<span class="keyword">$this</span>-&gt;checkFileSize() || !<span class="keyword">$this</span>-&gt;checkFileType())&#123;</span></span><br><span class="line"><span class="php">							$errors[]=<span class="keyword">$this</span>-&gt;getError();</span></span><br><span class="line"><span class="php">							$return=<span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">						&#125;</span></span><br><span class="line"><span class="php">					&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">						$error[]=<span class="keyword">$this</span>-&gt;getError();</span></span><br><span class="line"><span class="php">						$return=<span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">					&#125;</span></span><br><span class="line"><span class="php">					<span class="keyword">if</span>(!$return)</span></span><br><span class="line"><span class="php">						<span class="keyword">$this</span>-&gt;setFiles();</span></span><br><span class="line"><span class="php">				&#125;</span></span><br><span class="line"><span class="php">				<span class="keyword">if</span>($return)&#123;</span></span><br><span class="line"><span class="php">					$fileNames=<span class="keyword">array</span>();</span></span><br><span class="line"><span class="php">					<span class="keyword">for</span>($i=<span class="number">0</span>; $i&lt;count($name); $i++)&#123;</span></span><br><span class="line"><span class="php">						<span class="keyword">if</span>(<span class="keyword">$this</span>-&gt;setFiles($name[$i], $tmp_name[$i], $size[$i], $error[$i]))&#123;</span></span><br><span class="line"><span class="php">							<span class="keyword">$this</span>-&gt;setNewFileName();</span></span><br><span class="line"><span class="php">							<span class="keyword">if</span>(!<span class="keyword">$this</span>-&gt;copyFile())&#123;</span></span><br><span class="line"><span class="php">								$errors=<span class="keyword">$this</span>-&gt;getError();</span></span><br><span class="line"><span class="php">								$return=<span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">							&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">								$fileNames[]=<span class="keyword">$this</span>-&gt;newFileName;</span></span><br><span class="line"><span class="php">							&#125;</span></span><br><span class="line"><span class="php">						&#125;</span></span><br><span class="line"><span class="php">					&#125;</span></span><br><span class="line"><span class="php">					<span class="comment">//是一个数组</span></span></span><br><span class="line"><span class="php">					<span class="keyword">$this</span>-&gt;newFileName=$fileNames;</span></span><br><span class="line"><span class="php">				&#125;</span></span><br><span class="line"><span class="php">				<span class="comment">//赋值错误信息</span></span></span><br><span class="line"><span class="php">				<span class="keyword">$this</span>-&gt;errorMess=$errors;</span></span><br><span class="line"><span class="php">				<span class="keyword">return</span> $return;</span></span><br><span class="line"><span class="php">			<span class="comment">//如果是单个文件上传</span></span></span><br><span class="line"><span class="php">			&#125; <span class="keyword">else</span> &#123;</span></span><br><span class="line"><span class="php">					<span class="keyword">if</span>(<span class="keyword">$this</span>-&gt;setFiles($name, $tmp_name, $size, $error))&#123;</span></span><br><span class="line"><span class="php">						<span class="keyword">if</span>(<span class="keyword">$this</span>-&gt;checkFileSize() &amp;&amp; <span class="keyword">$this</span>-&gt;checkFileType())&#123;</span></span><br><span class="line"><span class="php">							<span class="keyword">$this</span>-&gt;setNewFileName();</span></span><br><span class="line"><span class="php">							<span class="keyword">if</span>(<span class="keyword">$this</span>-&gt;copyFile())&#123;</span></span><br><span class="line"><span class="php">								<span class="keyword">return</span> <span class="keyword">true</span>;</span></span><br><span class="line"><span class="php">							&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">								$return=<span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">							&#125;</span></span><br><span class="line"><span class="php">						&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">							$return=<span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">						&#125;	</span></span><br><span class="line"><span class="php">					&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">						$return=<span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">					&#125;</span></span><br><span class="line"><span class="php">					</span></span><br><span class="line"><span class="php">					<span class="keyword">if</span>(!$return)</span></span><br><span class="line"><span class="php">						<span class="keyword">$this</span>-&gt;errorMess=<span class="keyword">$this</span>-&gt;getError();</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="php">					<span class="keyword">return</span> $return;</span></span><br><span class="line"><span class="php">			&#125;			</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"><span class="php">		</span></span><br><span class="line"><span class="php">		<span class="comment">//保存文件,将文件从临时路径移动到新路径</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">copyFile</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="php">			<span class="keyword">if</span>(!<span class="keyword">$this</span>-&gt;errorNum)&#123;</span></span><br><span class="line"><span class="php">				$filePath=rtrim(<span class="keyword">$this</span>-&gt;filePath, <span class="string">'/'</span>).<span class="string">'/'</span>;</span></span><br><span class="line"><span class="php">				$filePath.=<span class="keyword">$this</span>-&gt;newFileName;</span></span><br><span class="line"></span><br><span class="line"><span class="php">				<span class="keyword">if</span>(@move_uploaded_file(<span class="keyword">$this</span>-&gt;tmpFileName, $filePath))	&#123;</span></span><br><span class="line"><span class="php">					<span class="keyword">return</span> <span class="keyword">true</span>;</span></span><br><span class="line"><span class="php">				&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">					<span class="keyword">$this</span>-&gt;setOption(<span class="string">'errorNum'</span>, <span class="number">-3</span>);</span></span><br><span class="line"><span class="php">					<span class="keyword">return</span> <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">				&#125;</span></span><br><span class="line"><span class="php">					</span></span><br><span class="line"><span class="php">			&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">return</span> <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"></span><br><span class="line"><span class="php">		<span class="comment">//设置和$_FILES有关的内容</span></span></span><br><span class="line"><span class="php">		<span class="keyword">private</span> <span class="function"><span class="keyword">function</span> <span class="title">setFiles</span><span class="params">($name=<span class="string">""</span>, $tmp_name=<span class="string">''</span>, $size=<span class="number">0</span>, $error=<span class="number">0</span>)</span></span>&#123;</span></span><br><span class="line"><span class="php">		</span></span><br><span class="line"><span class="php">			<span class="keyword">$this</span>-&gt;setOption(<span class="string">'errorNum'</span>, $error);</span></span><br><span class="line"><span class="php">			<span class="keyword">if</span>($error)&#123;</span></span><br><span class="line"><span class="php">				<span class="keyword">return</span> <span class="keyword">false</span>;</span></span><br><span class="line"><span class="php">			&#125;</span></span><br><span class="line"><span class="php">			<span class="keyword">$this</span>-&gt;setOption(<span class="string">'originName'</span>, $name);</span></span><br><span class="line"><span class="php">			<span class="keyword">$this</span>-&gt;setOption(<span class="string">'tmpFileName'</span>, $tmp_name);</span></span><br><span class="line"><span class="php">			<span class="comment">//分割文件名，取最后一个后缀</span></span></span><br><span class="line"><span class="php">			$arrStr=explode(<span class="string">'.'</span>, $name); </span></span><br><span class="line"><span class="php">			<span class="keyword">$this</span>-&gt;setOption(<span class="string">'fileType'</span>, strtolower($arrStr[count($arrStr)<span class="number">-1</span>]));</span></span><br><span class="line"><span class="php">			<span class="keyword">$this</span>-&gt;setOption(<span class="string">'fileSize'</span>, $size);	</span></span><br><span class="line"><span class="php">			<span class="keyword">return</span> <span class="keyword">true</span>;</span></span><br><span class="line"><span class="php">		&#125;	</span></span><br><span class="line"></span><br><span class="line"><span class="php">		<span class="comment">//用于获取上传后文件的文件名</span></span></span><br><span class="line"><span class="php">		<span class="function"><span class="keyword">function</span> <span class="title">getNewFileName</span><span class="params">()</span></span>&#123;</span></span><br><span class="line"><span class="php">			<span class="keyword">return</span> <span class="keyword">$this</span>-&gt;newFileName;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"><span class="php">		</span></span><br><span class="line"><span class="php">		<span class="comment">//上传如果失败，则调用这个方法，就可以查看错误报告</span></span></span><br><span class="line"><span class="php">		<span class="function"><span class="keyword">function</span> <span class="title">getErrorMsg</span><span class="params">()</span> </span>&#123;</span></span><br><span class="line"><span class="php">			<span class="keyword">return</span> <span class="keyword">$this</span>-&gt;errorMess;</span></span><br><span class="line"><span class="php">		&#125;</span></span><br><span class="line"><span class="php">		</span></span><br><span class="line"><span class="php">	&#125;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight css">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"> <span class="selector-tag">upload</span><span class="selector-class">.php</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="php"><span class="meta">&lt;?php</span></span></span><br><span class="line"><span class="php">	<span class="keyword">require</span> <span class="string">"FileUpload.class.php"</span>;</span></span><br><span class="line"><span class="php">	<span class="comment">//实例化这个对象</span></span></span><br><span class="line"><span class="php">	$up=<span class="keyword">new</span> FileUpload(<span class="keyword">array</span>(<span class="string">'isRandName'</span>=&gt;<span class="keyword">true</span>,<span class="string">'allowType'</span>=&gt;<span class="keyword">array</span>(<span class="string">'txt'</span>, <span class="string">'doc'</span>, <span class="string">'php'</span>, <span class="string">'gif'</span>),<span class="string">'filePath'</span>=&gt;<span class="string">'./uploads/'</span>, <span class="string">'maxSize'</span>=&gt;<span class="number">200000</span>));</span></span><br><span class="line"><span class="php">	<span class="keyword">echo</span> <span class="string">'&lt;pre&gt;'</span>;</span></span><br><span class="line"><span class="php">	<span class="comment">//调用上传文件的方法</span></span></span><br><span class="line"><span class="php">	<span class="keyword">if</span>($up-&gt;uploadFile(<span class="string">'upload'</span>))&#123;</span></span><br><span class="line"><span class="php">		print_r($up-&gt;getNewFileName());</span></span><br><span class="line"><span class="php">	&#125;<span class="keyword">else</span>&#123;</span></span><br><span class="line"><span class="php">		print_r($up-&gt;getErrorMsg());	</span></span><br><span class="line"><span class="php">	&#125;</span></span><br><span class="line"><span class="php">	<span class="keyword">echo</span> <span class="string">'&lt;/pre&gt;'</span>;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight css">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"> <span class="selector-tag">form</span><span class="selector-class">.html</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight pgsql">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">&lt;form action="upload.php" <span class="keyword">method</span>="post" enctype="multipart/form-data"&gt;</span><br><span class="line">	&lt;<span class="keyword">input</span> <span class="keyword">type</span>="hidden" <span class="type">name</span>="MAX_FILE_SIZE" <span class="keyword">value</span>="100000000"&gt;</span><br><span class="line">	&lt;<span class="keyword">input</span> <span class="keyword">type</span>="file" <span class="type">name</span>="upload"&gt; &lt;br&gt;</span><br><span class="line">	&lt;<span class="keyword">input</span> <span class="keyword">type</span>="submit" <span class="type">name</span>="sub" <span class="keyword">value</span>="upload file"&gt;&lt;br&gt;</span><br><span class="line">&lt;/form&gt;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight css">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"> 多文件上传的 <span class="selector-tag">form</span><span class="selector-class">.html</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight pgsql">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">&lt;form action="upload.php" <span class="keyword">method</span>="post" enctype="multipart/form-data"&gt;</span><br><span class="line">	&lt;<span class="keyword">input</span> <span class="keyword">type</span>="hidden" <span class="type">name</span>="MAX_FILE_SIZE" <span class="keyword">value</span>="100000000"&gt;</span><br><span class="line">	&lt;<span class="keyword">input</span> <span class="keyword">type</span>="file" <span class="type">name</span>="upload[]"&gt; &lt;br&gt;</span><br><span class="line">	&lt;<span class="keyword">input</span> <span class="keyword">type</span>="file" <span class="type">name</span>="upload[]"&gt; &lt;br&gt;</span><br><span class="line">	&lt;<span class="keyword">input</span> <span class="keyword">type</span>="file" <span class="type">name</span>="upload[]"&gt; &lt;br&gt;</span><br><span class="line">	&lt;<span class="keyword">input</span> <span class="keyword">type</span>="file" <span class="type">name</span>="upload[]"&gt; &lt;br&gt;</span><br><span class="line">	&lt;<span class="keyword">input</span> <span class="keyword">type</span>="submit" <span class="type">name</span>="sub" <span class="keyword">value</span>="upload file"&gt;&lt;br&gt;</span><br><span class="line">&lt;/form&gt;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>利用上面的这个文件上传类，我们便可以轻松地实现文件上传，非常之便捷。</p>
                <h2 id="文件下载"><a href="#文件下载" class="headerlink" title="文件下载"></a>文件下载</h2>
                <p>对于浏览器无法直接打开的文件，我们一般只需要设置一下超链接就好了。比如</p>
                <figure class="highlight livecodeserver">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">&lt;<span class="keyword">a</span> href=<span class="string">"a.rar"</span>&gt;<span class="keyword">a</span>.rar&lt;/<span class="keyword">a</span>&gt;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>点击超链接之后，便会弹出下载的提示框。 可是对于浏览器可以直接打开的文件，例如 1.html，2.php，3.gif 等等文件，如果仍然用这种超链接形式，那就行不通了，浏览器会直接跳转到这个页面。 我们怎样解决这个问题呢？很简单 我们首先要将超链接的文件名改为一个 php 文件，比如上面的链接就可以改为</p>
                <figure class="highlight xml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"a.php"</span>&gt;</span>logo.gif<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>这样浏览器会去访问 a.php 文件，那么我们只需要在 a.php 文件中作相应处理即可，例如我们要下载 logo.gif 文件 我们就需要在 a.php 文件最开始设定头部信息，如下</p>
                <figure class="highlight lasso">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">&lt;?php </span><br><span class="line">	<span class="keyword">header</span>(<span class="string">"Content-Type:image/gif"</span>);</span><br><span class="line">	<span class="keyword">header</span>(<span class="string">'Content-Disposition: attachment; filename="logo.gif"'</span>);</span><br><span class="line">	<span class="keyword">header</span>(<span class="string">'Content-Length:300'</span>);</span><br><span class="line">    readfile(<span class="string">"logo.gif"</span>);</span><br><span class="line"><span class="meta">?&gt;</span></span><br></pre>
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